The 1936M/12 Key set by Bahco includes a socket spanner and twelve pieces, and is designed for heavy-duty applications. It is made from steel, chrome vanadium, and alloy steel for strength and durability. The key set features a ratchet and sliding action, and is equipped with a convenient storage pouch. The set includes standard and metric measurements, and can be used for a variety of applications, including fastening and loosening nuts, bolts, and screws. The keys are also designed to work in confined spaces or at difficult-to-reach angles.